#!/usr/bin/python
# -*- coding: utf-8 -*-

# (c) 2012, Michael DeHaan <michael.dehaan@gmail.com>
#
# This file is part of Ansible
#
# Ansible is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Ansible is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.

import os
import time

DOCUMENTATION = '''
---
module: copy
short_description: Copies files to remote locations.
description:
     - The M(copy) module copies a file on the local box to remote locations.
options:
  src:
    description:
      - Local path to a file to copy to the remote server; can be absolute or relative.
    required: false
    default: null
    aliases: []
  content:
    version_added: "1.1"
    description:
      - When used instead of 'src', sets the contents of a file directly to the specified value.
    required: false
    default: null
  dest:
    description:
      - Remote absolute path where the file should be copied to.
    required: true
    default: null
  backup:
    description:
      - Create a backup file including the timestamp information so you can get
        the original file back if you somehow clobbered it incorrectly.
    version_added: "0.7"
    required: false
    choices: [ "yes", "no" ]
    default: "no"
  force:
    description:
      - the default is C(yes), which will replace the remote file when contents
        are different than the source.  If C(no), the file will only be transferred
        if the destination does not exist.
    version_added: "1.1"
    required: false
    choices: [ "yes", "no" ]
    default: "yes"
    aliases: [ "thirsty" ]
  validate:
    description:
      - The validation command to run before copying into place.  The path to the file to
        validate is passed in via '%s' which must be present as in the visudo example below.
    required: false
    default: ""
    version_added: "1.2"
  others:
    description:
      - all arguments accepted by the M(file) module also work here
    required: false
author: Michael DeHaan
notes:
   - The "copy" module can't be used to recursively copy directory structures to the target machine. Please see the
     "Delegation" section of the Advanced Playbooks documentation for a better approach to recursive copies.
'''

EXAMPLES = '''
# Example from Ansible Playbooks
- copy: src=/srv/myfiles/foo.conf dest=/etc/foo.conf owner=foo group=foo mode=0644

# Copy a new "ntp.conf file into place, backing up the original if it differs from the copied version
- copy: src=/mine/ntp.conf dest=/etc/ntp.conf owner=root group=root mode=644 backup=yes

# Copy a new "sudoers" file into place, after passing validation with visudo
- copy: src=/mine/sudoers dest=/etc/sudoers validate='visudo -cf %s'
'''

def main():

    module = AnsibleModule(
        # not checking because of daisy chain to file module
        argument_spec = dict(
            src               = dict(required=False),
            original_basename = dict(required=False), # used to handle 'dest is a directory' via template, a slight hack
            content           = dict(required=False, no_log=True),
            dest              = dict(required=True),
            backup            = dict(default=False, type='bool'),
            force             = dict(default=True, aliases=['thirsty'], type='bool'),
            validate          = dict(required=False, type='str'),
        ),
        add_file_common_args=True,
    )

    src    = os.path.expanduser(module.params['src'])
    dest   = os.path.expanduser(module.params['dest'])
    backup = module.params['backup']
    force  = module.params['force']
    original_basename = module.params.get('original_basename',None)
    validate = module.params.get('validate',None)

    if not os.path.exists(src):
        module.fail_json(msg="Source %s failed to transfer" % (src))
    if not os.access(src, os.R_OK):
        module.fail_json(msg="Source %s not readable" % (src))

    md5sum_src = module.md5(src)
    md5sum_dest = None

    if os.path.exists(dest):
        if not force:
            module.exit_json(msg="file already exists", src=src, dest=dest, changed=False)
        if (os.path.isdir(dest)):
            basename = os.path.basename(src)
            if original_basename:
                basename = original_basename
            dest = os.path.join(dest, basename)
        if os.access(dest, os.R_OK):
            md5sum_dest = module.md5(dest)
    else:
        if not os.path.exists(os.path.dirname(dest)):
            module.fail_json(msg="Destination directory %s does not exist" % (os.path.dirname(dest)))
    if not os.access(os.path.dirname(dest), os.W_OK):
        module.fail_json(msg="Destination %s not writable" % (os.path.dirname(dest)))

    backup_file = None
    if md5sum_src != md5sum_dest or os.path.islink(dest):
        try:
            if backup:
                if os.path.exists(dest):
                    backup_file = module.backup_local(dest)
            # allow for conversion from symlink.
            if os.path.islink(dest):
                os.unlink(dest)
                open(dest, 'w').close()
            if validate:
                (rc,out,err) = module.run_command(validate % src)
                if rc != 0:
                    module.fail_json(msg="failed to validate: rc:%s error:%s" % (rc,err))
            module.atomic_move(src, dest)
        except IOError:
            module.fail_json(msg="failed to copy: %s to %s" % (src, dest))
        changed = True
    else:
        changed = False

    res_args = dict(
        dest = dest, src = src, md5sum = md5sum_src, changed = changed
    )
    if backup_file:
        res_args['backup_file'] = backup_file

    module.params['dest'] = dest
    file_args = module.load_file_common_arguments(module.params)
    res_args['changed'] = module.set_file_attributes_if_different(file_args, res_args['changed'])

    module.exit_json(**res_args)

# this is magic, see lib/ansible/module_common.py
#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
main()
